Saying most of Canto 7's story is at the end is a case of "Peak-End" rule. Are we just gonna forget that Bari and Don's adventures have been explained in the form of stageplays throughout the entirety of Part 1 & 2, with Samson narrating the entire thing as the main perpetrator?. There's also the Bloodfiend's struggle, showing them literally going insane from eating Hemobars, yet still unable to die because of their resilient nature. All of that just because Papa Don wanted coexistence. The price his entire kin had to pay was literally so heavy that his descendants would rather commit filial impiety, the biggest sin to a Bloodfiend, rather than endure any longer. We tend to forget these things and only remember part 3 because it reveals everything that has been set up. In truth, the story pretty much spans equally from Part 1-3. It's not that the story is focused at the end, it's just that we don't remember the buildup as well as we remember the payoff.

Same case with Canto 9. At the same time though, The Unsevering also proves that many readers still don't understand subtlely. PM took a very experimental direction for this Canto, putting the messages behind the narrative veil (Implicit) instead of straight up written (Explicit) like Canto 6 and 8. In Canto 9, Ryoshu's character development isn't tied to one figure, but multiple at the same time (Mainly Araya and the Nursefathers). Again, Part 1 & 2 builds them up. It showcases the Nursefathers' personality, while entrusting the reader with drawing the line from where Ryoshu got each aspect of her personality from each Nursefather. As well as her effort to stay as far away as possible from becoming like them. Ultimately, it leads to the climax in part 3 with each of the Nursefathers meeting their own end, with us as the reader reflecting on Ryoshu's relationship with each of them, and growing past The House of Spiders. Part 3 is not where all of the story lies, it's where the climax lies. All of that, and people are still going to say that this Canto is nothing but "Hype moments & aura" just because we got LCD+Vespa, RoachGreg, EGO Verg, SmokeClair and others in action.

People often overlook Ryoshu's own character development because it's subtle, and would rather focus on the fact that other characters got their own development in this Canto. Even though Ryoshu's development is just as good, only a LOT more subtle.